math
In a certain high school class, consisting of 60 girls and 40 boys , it is observed that 24 girls and 16 boys wear eyeglasses. If a student is picked at rondom from this class, the probability that the student wears eyeglasses is 40/100. what is the probability that a student ...December 2, 2016

Algebra
If you make a bunch of cookies, and ten of your friends wanted some cookies. There are, in total, 5 dozen (60) cookies. Each dozen is a different kind; chocolate chip, oatmeal, no-bake, peanutbutter, and gingerbread. If you put all 60 cookies in a tin, which I wouldn't ...April 28, 2015

math
For his next trick, a magician will draw a royal flush  10, Jack, Queen, King and Ace of the same suit  in the exact order without replacement. If there are no magic tricks and just pure randomness, what is the probability that he'll succeed?February 14, 2015

Statistics
The arena has a policy of selling as many as 16 tickets for a show for which there are only 15 seats available. The manager has noticed in the past that only 88% of people who purchase a ticket annually come for the show. Find the probability that if 16 tickets are sold, not ...June 29, 2013

probability April-004
In a random sample of 95 sections of pipe in a chemical plant, 16 showed signs of serious corrosion. Construct a 98% confidence interval for the true proportion of pipe sections showing signs of serious corrosion, using the large sample confidence interval formula.April 18, 2013

probability April-03
How large a sample will we need to be able to assert with probability 0. 90 that the sample mean will not differ from the true mean by more then 2.5 units? Assume that it is known from past experience thatApril 18, 2013

probability April-02
Suppose flaws occur on the surface of glass with density of 3 per square meter. What is the probability of there being exactly 4 flaws on a sheet of glass of area 0.5 square meter?April 18, 2013

math
it is dark in room and i went to get two socks of he same colour from my drawer,which contains 26 red,24 blue and 34 brown socks.how many socks do i have to take from he drawer to get at least two socks of the each colour?September 8, 2012

math
The University Entrance scores are normally distributed with a mean of 250 and a standard deviation of 30. What is the probability that a randomly selected student scored lower than 250?May 25, 2011

statistics
A charity believes that when it puts out an appeal for charitable donations the donations it receives will normally distributed with a mean of $50 and standard deviation of $6, and it is assumed that donations will be independent of each other. (i) Find the probability that a ...February 15, 2011